Production method for olefin-based polymer, and olefin polymerization catalyst

ABSTRACT

Provided is a production method for an olefin-based polymer, including polymerizing an olefin raw material using (A) a transition metal compound, (B) a boron compound capable of forming an ion pair with the component (A), (C) a specific organoaluminum compound, and (D) a specific aluminoxane in presence of at least one or more kinds of (N) a nonpolymerizable unsaturated hydrocarbon in the olefin raw material or a polymerization solvent.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a National Stage of PCT/JP2015/061294, which wasfiled on Apr. 10, 2015. This application is based upon and claims thebenefit of priority to Japanese Application No. 2014-082365, which wasfiled on Apr. 11, 2014.

TECHNICAL FIELD

The present invention relates to a production method for an olefin-basedpolymer and an olefin polymerization catalyst.

BACKGROUND ART

Hitherto, in a polymerization reaction of an olefin-based polymer, apolymerization catalyst containing, for example, a transition metalcompound and a promoter component (e.g., a metallocene catalyst or aZiegler catalyst) has been generally used. In such polymerizationreaction, it is preferred from an economical point of view that activitybe improved. In addition, the activity improvement is preferred alsofrom the viewpoint that an amount of a catalyst residue to be containedin a product polymer can be reduced to improve product quality.Therefore, various technological developments concerning thepolymerization reaction of the olefin-based polymer have heretofore beenmade for the purpose of the activity improvement.

An example of the technological developments is specifying of thetransition metal compound or the promoter component. In addition tothat, reaction conditions have also been investigated in detail. As aresult, it has heretofore been found that compounds such as water,carbon monoxide, carbon dioxide, and carbonyl sulfide are catalystpoisons for the polymerization catalyst. Particularly in polymerizationinvolving using a metallocene catalyst having high activity, an amountof the catalyst to be used is small, and hence the catalyst poisons havelarge influences on the polymerization reaction. On the basis of thisfinding, various production methods have been developed. For example,there is known a method involving purifying a solvent, a monomer, or thelike, to thereby reduce amounts of those compounds to certain amounts orless, and then performing the reaction. As specific means therefor, inPatent Literature 1, there are disclosed methods to be performed beforethe polymerization reaction, for an impurity contained in the solvent orthe monomer to be used, as follows: a method involving allowing an inertgas, such as nitrogen or argon, to flow through the solvent or themonomer; a method involving loading sodium or potassium metal and thenperforming distillation in an inert gas atmosphere; and a purificationmethod involving using an adsorbent, such as nickel, zinc oxide, coppersulfide, silica, or activated carbon. In addition to that, there isknown a method involving adding a scavenger in order to neutralize thepoisons of the above-mentioned compounds remaining in a reaction system.For example, in Patent Literature 2, an organoaluminum compound isdisclosed as the scavenger.

CITATION LIST Patent Literature

PTL 1: JP 2011-144293 A

PTL 2: JP 2001-329007 A

SUMMARY OF INVENTION Technical Problem

In an olefin polymerization process, an unexpected side reactionproceeds during its course to generate a nonpolymerizable unsaturatedhydrocarbon. For example, in the course of purifying an olefin rawmaterial, oligomerization of the olefin raw material proceeds owing to aloaded catalyst to generate the nonpolymerizable unsaturatedhydrocarbon. In addition, in a step of deactivating the catalyst,postpolymerization of the olefin raw material may proceed owing to thecatalyst in an insufficiently deactivated state to causeoligomerization, resulting in the generation of the nonpolymerizableunsaturated hydrocarbon. In addition, in a step of drying a polymer, thepolymer may undergo thermal decomposition at the time of its heating togenerate the nonpolymerizable unsaturated hydrocarbon. In addition, anonpolymerizable unsaturated hydrocarbon component is also generatedfrom an organoaluminum compound to be used as a scavenger bydissociation equilibrium. The inventors of the present invention havefound that in a polymerization reaction involving using a metallocenecomplex, when an unexpectedly generated nonpolymerizable unsaturatedhydrocarbon is mingled during the purification or a posttreatment step,there occurs a problem in that the nonpolymerizable unsaturatedhydrocarbon is inserted into an active site of the metallocene complexto form a dormant species (inactive species), with the result thatcatalytic activity is markedly reduced.

In addition, when the nonpolymerizable unsaturated hydrocarbon differentfrom the olefin raw material is incorporated into a product polymer, aproblem occurs in that its growth reaction is suppressed to reduce itsmolecular weight, or a polymer is eliminated from a dormant structure tochange a terminal structure, and thus a polymer having propertiesdifferent from those of an intended product polymer is mingled,resulting in a reduction in quality. In recent years, catalytic activityhas been dramatically improved due to a further increase in performanceof a complex, and in order to express high activity, the course ofpurifying the above-mentioned olefin raw material, and the recyclingprocess of the olefin raw material left unreacted in the polymerizationsystem have been essential. In addition, it cannot be avoided that apostpolymerization reaction proceeds owing to the high-performancecatalyst in a slight residence time at the time of deactivation of thecatalyst. Accordingly, the generation of a trace amount of thenonpolymerizable unsaturated hydrocarbon component, and the activityreduction and the quality reduction due to the component have becomeunavoidable problems.

A method involving using a chain transfer agent is conceivable as atechnique for reactivating the dormant species formed by the olefincomponent different from the raw material monomer, but its effect isunknown. As the chain transfer agent, there is known hydrogen, analkylzinc, or the like. However, it is known that when hydrogen is used,the degree of polymerization of the polymer is changed. In addition, thealkylzinc has a problem of causing a side reaction.

The present invention has been made in view of the above-mentionedcircumstances, and an object of the present invention is to provide aproduction method for an olefin-based polymer and an olefinpolymerization catalyst that provide high catalytic activity at the timeof polymerization and that can provide an olefin-based polymer ofintended quality.

Solution to Problem

The inventors of the present invention have made extensiveinvestigations, and as a result, have found that the above-mentionedobject is achieved through the use of a catalyst obtained by bringingspecific components into contact with each other. The present inventionhas been completed on the basis of such finding.

That is, the present invention provides the following items 1 to 12.

1. A production method for an olefin-based polymer, comprisingpolymerizing an olefin raw material using the following components (A)to (D) in presence of at least one or more kinds of the followingcomponent (N) in the olefin raw material or a polymerization solvent:

(A) a transition metal compound;

(B) a boron compound capable of forming an ion pair with the component(A);

(C) an organoaluminum compound represented by the following generalformula (VIII);

(D) an aluminoxane represented by the following general formula (i) or(ii);

(N) a nonpolymerizable unsaturated hydrocarbon:R¹⁷ _(v)AlJ_(3-v)  (VIII)in the general formula (VIII), R¹⁷ represents an alkyl group having 1 to20 carbon atoms, J represents a hydrogen atom, an alkoxy group having 1to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, or ahalogen atom, v represents an integer of from 1 to 3, and when vrepresents 2 or more, R¹⁷'s may be identical to or different from eachother, provided that at least one R¹⁷ represents an alkyl group having 1to 20 carbon atoms; and

wherein in the general formulae (i) and (ii), Ra represents an alkylgroup having 1 to 20 carbon atoms, Ra's may be identical to or differentfrom each other, and n represents an integer of from 1 to 50.

2. The production method for an olefin-based polymer according to Item1, wherein a molar ratio [(D)/(A)] of a molar quantity of an aluminumatom in the component (D) to a molar quantity of a transition metal inthe component (A) is more than 2.

3. The production method for an olefin-based polymer according to Item 1or 2, wherein a molar ratio [(C)/(D)] of a molar quantity of an aluminumatom in the component (C) to a molar quantity of an aluminum atom in thecomponent (D) is 0.01 or more.

4. The production method for an olefin-based polymer according to anyone of Items 1 to 3, wherein the component (C) is represented by thefollowing general formula (iii):

wherein in the general formula (iii), Rb represents an alkyl grouphaving 1 to 20 carbon atoms, and Rb's may be identical to or differentfrom each other.

5. The production method for an olefin-based polymer according to anyone of Items 1 to 4, wherein the olefin raw material comprises one ormore kinds selected from α-olefins each having 3 to 30 carbon atoms andethylene.

6. The production method for an olefin-based polymer according to anyone of Items 1 to 5, wherein the (N) nonpolymerizable unsaturatedhydrocarbon comprises a disubstituted olefin, a trisubstituted olefin,or a tetrasubstituted olefin represented by the following generalformula (iv), or an alkyne compound represented by the following generalformula (v):

wherein in the general formula (iv), R^(a) to R^(d) each independentlyrepresent hydrogen or a hydrocarbon group having 1 or more carbon atoms,provided that at least two or more selected from R^(a) to R^(d) eachrepresent the hydrocarbon group; andR^(e)

R^(f)  (v)

wherein in the general formula (v), R^(e) and R^(f) each independentlyrepresent hydrogen or a hydrocarbon group having 1 or more carbon atoms.

7. The production method for an olefin-based polymer according to anyone of Items 1 to 6, wherein a molar ratio [(N)/(A)] of a molar quantityof the component (N) to a molar quantity of a transition metal in thecomponent (A) is 500 or more.

8. The production method for an olefin-based polymer according to anyone of Items 1 to 7, wherein the component (D) is used in such an amountthat, with respect to catalytic activity in a case of polymerizing anolefin in presence of a catalyst obtained by bringing the component (A),the component (B), and the component (C) into contact with each other,the catalytic activity in a case of using the component (D) in place ofthe component (B) is 1/10 or less.

9. An olefin polymerization catalyst, which is obtained by bringing thefollowing components (A) to (D) into contact with each other:

(A) a transition metal compound;

(B) a boron compound capable of forming an ion pair with the component(A);

(C) an organoaluminum compound represented by the following generalformula (VIII); and

(D) an aluminoxane represented by the following general formula (i) or(ii):R¹⁷ _(v)AlJ_(3-v)  (VIII)wherein in the general formula (VIII), R¹⁷ represents an alkyl grouphaving 1 to 20 carbon atoms, J represents a hydrogen atom, an alkoxygroup having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbonatoms, or a halogen atom, v represents an integer of from 1 to 3, andwhen v represents 2 or more, R¹⁷'s may be identical to or different fromeach other, provided that at least one R¹⁷ represents an alkyl grouphaving 1 to 20 carbon atoms; and

wherein in the general formulae (i) and (ii), Ra represents an alkylgroup having 1 to 20 carbon atoms, Ra's may be identical to or differentfrom each other, and n represents an integer of from 1 to 50.

10. The olefin polymerization catalyst according to Item 9, wherein theolefin polymerization catalyst is obtained by bringing the component(A), the component (B), and the component (C) into contact with eachother, and then bringing the resultant into contact with the component(D).

11. The olefin polymerization catalyst according to Item 9 or 10,wherein a molar ratio [(D)/(A)] of a molar quantity of an aluminum atomin the component (D) to a molar quantity of a transition metal in thecomponent (A) is more than 2.

12. The olefin polymerization catalyst according to any one of Items 9to 11, wherein a molar ratio [(C)/(D)] of a molar quantity of analuminum atom in the component (C) to a molar quantity of an aluminumatom in the component (D) is 0.01 or more.

Advantageous Effects of Invention

According to the present invention, there can be provided the productionmethod for an olefin-based polymer and the olefin polymerizationcatalyst that provide high catalytic activity at the time ofpolymerization and that can provide an olefin-based polymer of intendedquality.

DESCRIPTION OF EMBODIMENTS

[Production Method for Olefin-Based Polymer]

A production method for an olefin-based polymer according to one aspectof the present invention comprises polymerizing an olefin raw materialusing the following components (A) to (D) in presence of at least one ormore kinds of the following component (N) in the olefin raw material ora polymerization solvent:

(A) a transition metal compound;

(B) a boron compound capable of forming an ion pair with the component(A);

(C) an organoaluminum compound represented by the following generalformula (VIII);

(D) an aluminoxane represented by the following general formula (i) or(ii);

(N) a nonpolymerizable unsaturated hydrocarbon:R¹⁷ _(v)AlJ_(3-v)  (VIII)wherein in the general formula (VIII), R¹⁷ represents an alkyl grouphaving 1 to 20 carbon atoms, J represents a hydrogen atom, an alkoxygroup having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbonatoms, or a halogen atom, v represents an integer of from 1 to 3, andwhen v represents 2 or more, R¹⁷'s may be identical to or different fromeach other, provided that at least one R¹⁷ represents an alkyl grouphaving 1 to 20 carbon atoms; and

wherein in the general formulae (i) and (ii), Ra represents an alkylgroup having 1 to 20 carbon atoms, Ra's may be identical to or differentfrom each other, and n represents an integer of from 1 to 50.

Now, the components and production method to be used in the presentinvention are described one by one.

<(A) Transition Metal Compound>

The transition metal compound serving as the component (A) to be used inthe present invention only needs to be a complex capable of forming asingle-site catalyst having a single active site. Among such complexes,a chelate complex, a metallocene complex having a non-crosslinked ligandor a crosslinked ligand, and the like are preferred.

Examples of the chelate complex includeN,N-bis(2,6-diisopropylphenyl)-1,2-dimethylethylenediiminonickeldibromide and N,N-bis(2,6-diisopropylphenyl)-1,2-dimethylethylenediiminopalladiumdibromide.

Examples of the metallocene complex having a non-crosslinked ligandinclude biscyclopentadienylzirconium dichloride,bis(n-butylcyclopentadienyl)zirconium dichloride,bis(pentamethylcyclopentadienyl)zirconium dichloride, andbisindenylzirconium dichloride.

The polymerization activity of a metallocene complex in which ligandsform a crosslinked structure via a crosslinking group is higher thanthat of a metallocene complex in which no crosslinked structure isformed.

Therefore, among the metallocene complexes, a metallocene complex inwhich ligands form a crosslinked structure via a crosslinking group ispreferred, a monocrosslinked metallocene complex and a doublecrosslinked metallocene complex are more preferred, and a doublecrosslinked metallocene complex is most preferred.

Examples of the monocrosslinked metallocene complex includedimethylsilylene(tetramethylcyclopentadienyl)(3-tert-butyl-5-methyl-2-phenoxy)zirconiumdichloride,dimethylsilylene(tetramethylcyclopentadienyl)(tert-butylamido)zirconiumdichloride, dimethylsilylenebis(2-methyl-4,5-benzoindenyl)zirconiumdichloride, dimethylsilylenebis(2-methyl-4-phenylindenyl)zirconiumdichloride, dimethylsilylenebis(2-methyl-4-naphthylindenyl)zirconiumdichloride, dimethylsilylenebis(2-methylindenyl)zirconium dichloride,and ethylenebis(2-methylindenyl)zirconium dichloride.

A specific example of the double crosslinked metallocene complex is adouble crosslinked metallocene complex represented by the followinggeneral formula (I):

wherein in the general formula (I), M represents a metal element ofGroups 3 to 10 of the periodic table or the lanthanoid series, E¹ and E²each represent a ligand selected from a substituted cyclopentadienylgroup, an indenyl group, a substituted indenyl group, aheterocyclopentadienyl group, a substituted heterocyclopentadienylgroup, an amide group, a phosphide group, a hydrocarbon group, and asilicon-containing group, form a crosslinked structure via A¹ and A²,and may be identical to or different from each other, X represents aσ-bonding ligand, and when a plurality of X's are present, the pluralityof X's may be identical to or different from each other, and X may becrosslinked with any other X, E¹, E², or Y, Y represents a Lewis base,and when a plurality of Y's are present, the plurality of Y's may beidentical to or different from each other, and Y may be crosslinked withany other Y, E¹, E², or X, A¹ and A² each represent a divalentcrosslinking group for bonding two ligands, specifically a hydrocarbongroup having 1 to 20 carbon atoms, a halogen-containing hydrocarbongroup having 1 to 20 carbon atoms, a silicon-containing group, agermanium-containing group, a tin-containing group, —O—, —CO—, —S—,—SO₂—, —Se—, —NR¹—, —PR¹—, —P(O)R¹—, —BR¹—, or —AlR¹—, wherein R¹represents a hydrogen atom, a halogen atom, a hydrocarbon group having 1to 20 carbon atoms, or a halogen-containing hydrocarbon group having 1to 20 carbon atoms, and may be identical to or different from eachother, q represents an integer of from 1 to 5 representing [(valence ofM)−2], and r represents an integer of from 0 to 3.

In the general formula (I), M represents a metal element of Groups 3 to10 of the periodic table or the lanthanoid series, and specific examplesthereof include titanium, zirconium, hafnium, yttrium, vanadium,chromium, manganese, nickel, cobalt, palladium, and lanthanoid metals.Among them, titanium, zirconium, and hafnium are suitable in terms ofolefin polymerization activity and the like.

E¹ and E² each represent a ligand selected from a substitutedcyclopentadienyl group, an indenyl group, a substituted indenyl group, aheterocyclopentadienyl group, a substituted heterocyclopentadienylgroup, an amide group (—N<), a phosphine group (—P<), a hydrocarbongroup [>CR— or >C<], and a silicon-containing group [>SiR— or >Si<],wherein R represents hydrogen, a hydrocarbon group having 1 to 20 carbonatoms, or a hetero atom-containing group, and form a crosslinkedstructure via A¹ and A².

In addition, E¹ and E² may be identical to or different from each other.

The E¹ and E² each preferably represent a substituted cyclopentadienylgroup, an indenyl group, and a substituted indenyl group becausepolymerization activity is further increased.

In addition, X represents a σ-bonding ligand. When a plurality of X'sare present, the plurality of X's may be identical to or different fromeach other. X may be crosslinked with any other X, E¹, E², or Y.

Specific examples of the X include a halogen atom, a hydrocarbon grouphaving 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbonatoms, an aryloxy group having 6 to 20 carbon atoms, an amide grouphaving 1 to 20 carbon atoms, a silicon-containing group having 1 to 20carbon atoms, a phosphide group having 1 to 20 carbon atoms, a sulfidegroup having 1 to 20 carbon atoms, and an acyl group having 1 to 20carbon atoms.

Meanwhile, Y represents a Lewis base. When a plurality of Y's arepresent, the plurality of Y's may be identical to or different from eachother. Y may be crosslinked with any other Y, E¹, E², or X. Specificexamples of the Lewis base represented by Y may include amines, ethers,phosphines, and thioethers.

Next, A¹ and A² each represent a divalent crosslinking group for bondingtwo ligands, specifically a hydrocarbon group having 1 to 20 carbonatoms, a halogen-containing hydrocarbon group having 1 to 20 carbonatoms, a silicon-containing group, a germanium-containing group, atin-containing group, —O—, —CO—, —S—, —SO₂—, —Se—, —NR¹—, —PR¹—,—P(O)R¹—, —BR¹—, or —AlR¹—, wherein R¹ represents a hydrogen atom, ahalogen atom, a hydrocarbon group having 1 to 20 carbon atoms, or ahalogen-containing hydrocarbon group having 1 to 20 carbon atoms, andmay be identical to or different from each other.

As such crosslinking group, for example, there is given one representedby the general formula:

wherein D¹ represents carbon, silicon, or tin, R² and R³ each representa hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms, maybe identical to or different from each other, and may be bonded to eachother to form a ring structure, and e represents an integer of from 1 to4.

Specific examples thereof include a methylene group, an ethylene group,an ethylidene group, a propylidene group, an isopropylidene group, acyclohexylidene group, a 1,2-cyclohexylene group, a vinylidene group(CH₂═C═), a dimethylsilylene group, a diphenylsilylene group, amethylphenylsilylene group, a dimethylgermirene group, adimethylstannylene group, a tetramethyldisilylene group, and adiphenyldisilylene group.

Among them, an ethylene group, an isopropylidene group, and adimethylsilylene group are suitable because polymerization activity isfurther increased.

q represents an integer of from 1 to 5 representing [(valence of M)−2],and r represents an integer of from 0 to 3.

Among the double crosslinked metallocene complexes each represented bythe general formula (I) as described above, a metallocene complex using,as its ligands, double crosslinked biscyclopentadienyl derivativesrepresented by the general formula (II):

is preferred because polymerization activity is further increased.

In the general formula (II), M, A¹, A², q, and r are the same as thosedescribed above.

X¹ represents a σ-bonding ligand. When a plurality of X¹'s are present,the plurality of X¹'s may be identical to or different from each other.X¹ may be crosslinked with any other X¹ or Y¹.

Specific examples of the X¹ may include the same examples as those givenin the description of X in the general formula (I).

Y¹ represents a Lewis base. When a plurality of Y¹'s are present, theplurality of Y¹'s may be identical to or different from each other. Y¹may be crosslinked with any other Y¹ or X¹.

Specific examples of the Y¹ may include the same examples as those givenin the description of Y in the general formula (I).

R⁴ to R⁹ each represent a hydrogen atom, a halogen atom, a hydrocarbongroup having 1 to 20 carbon atoms, a halogen-containing hydrocarbongroup having 1 to 20 carbon atoms, a silicon-containing group, or ahetero atom-containing group, and it is necessary that at least one ofR⁴ to R⁹ not represent a hydrogen atom.

In addition, R⁴ to R⁹ may be identical to or different from each other,and adjacent groups may be bonded to each other to form a ring.

Among them, it is preferred that R⁶ and R⁷ form a ring and that R⁸ andR⁹ form a ring, because polymerization activity is further increased.

R⁴ and R⁵ each preferably represent a group containing a hetero atom,such as oxygen, a halogen, or silicon because polymerization activity isfurther increased.

The metallocene complex using, as its ligands, the double crosslinkedbiscyclopentadienyl derivatives preferably contains silicon in acrosslinking group between the ligands.

Specific examples of the double crosslinked metallocene complexrepresented by the general formula (I) include complexes disclosed in JP2011-144293 A, and examples thereof include (1,2′-ethylene)(2,1′-ethylene)-bis(indenyl)zirconium dichloride,(1,2′-methylene)(2,1′-methylene)-bis(indenyl)zirconium dichloride,(1,2′-isopropylidene)(2,1′-isopropylidene)-bis(indenyl)zirconiumdichloride, (1,2′-ethylene)(2,1′-ethylene)-bis(3-methylindenyl)zirconium dichloride,(1,2′-ethylene)(2,1′-ethylene)-bis(4,5-benzoindenyl)zirconiumdichloride, (1,2′-ethylene)(2,1′-ethylene)-bis(4-isopropylindenyl)zirconium dichloride,(1,2′-ethylene) (2,1′-ethylene)-bis(5,6-dimethylindenyl)zirconiumdichloride,(1,2′-ethylene)(2,1′-ethylene)-bis(4,7-diisopropylindenyl)zirconiumdichloride, (1,2′-ethylene)(2,1′-ethylene)-bis(4-phenylindenyl)zirconium dichloride,(1,2′-ethylene)(2,1′-ethylene)-bis(3-methyl-4-isopropylindenyl)zirconium dichloride,(1,2′-ethylene) (2,1′-ethylene)-bis(5,6-benzoindenyl)zirconiumdichloride, (1,2′-ethylene)(2,1′-isopropylidene)-bis(indenyl)zirconiumdichloride, (1,2′-methylene)(2,1′-ethylene)-bis(indenyl)zirconiumdichloride, (1,2′-methylene)(2,1′-isopropylidene)-bis(indenyl)zirconiumdichloride,(1,2′-dimethylsilylene)(2,1′-dimethylsilylene)bis(indenyl)zirconiumdichloride,(1,2′-dimethylsilylene)(2,1′-dimethylsilylene)bis(3-methylindenyl)zirconiumdichloride,(1,2′-dimethylsilylene)(2,1′-dimethylsilylene)bis(3-n-butylindenyl)zirconiumdichloride,(1,2′-dimethylsilylene)(2,1′-dimethylsilylene)bis(3-isopropylindenyl)zirconiumdichloride,(1,2′-dimethylsilylene)(2,1′-dimethylsilylene)bis(3-trimethylsilylmethylindenyl)zirconiumdichloride, (1,2′-dimethylsilylene)(2,1′-dimethylsilylene)bis(3-phenylindenyl)zirconium dichloride, and(1,2′-dimethylsilylene)(2,1′-dimethylsilylene)bis(3-neopentyl-indenyl)zirconiumdichloride.

Of course, the double crosslinked metallocene complex is not limitedthereto.

In addition, the double crosslinked metallocene complex may be ananalogous compound of a metal element of any other group or thelanthanoid series.

In addition, in the above-mentioned compounds, (1,2′-)(2,1′-) may be(1,1′-)(2,2′-).

<(B) Boron Compound Capable of Forming Ion Pair with the Component (A)>

An example of the boron compound capable of forming an ion pair with thecomponent (A), which serves as the component (B) to be used in thepresent invention, may be a coordination complex compound formed of ananion with a plurality of groups bonded to boron and a cation.

There are various types of the coordination complex compound formed ofan anion with a plurality of groups bonded to boron and a cation, andfor example, a compound represented by the general formula (III) or (IV)may be preferably used:([L¹-H]^(s+))_(t)([BZ¹Z²Z³Z⁴]—)₁  (III)([L²]^(s+))_(t)([BZ¹Z²Z³Z⁴]—)₁  (IV)wherein in the general formula (III) or (IV): L² represents M¹,R¹⁰R¹¹M², or R¹² ₃C to be described later, L¹ represents a Lewis base,M¹ represents a metal selected from Group 1 and Group 8 to Group 12 ofthe periodic table, M² represents a metal selected from Group 8 to Group10 of the periodic table, Z¹ to Z⁴ each represent a hydrogen atom, adialkylamino group, an alkoxy group, an aryloxy group, an alkyl grouphaving 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms,an alkylaryl group, an arylalkyl group, a substituted alkyl group, anorganometalloid group, or a halogen atom;

R¹⁰ and R¹¹ each represent a cyclopentadienyl group, a substitutedcyclopentadienyl group, an indenyl group, or a fluorenyl group, and R¹²represents an alkyl group; and

s represents an integer of from 1 to 7 representing the ionic valence ofL¹-H or L², t represents an integer of 1 or more, and l=t×s.

M¹ represents a metal selected from Group 1 and Group 8 to Group 12 ofthe periodic table, and specific examples thereof include atoms of Ag,Cu, Na, and Li. M² represents a metal selected from Group 8 to Group 10of the periodic table, and specific examples thereof include atoms ofFe, Co, and Ni.

Specific examples of Z¹ to Z⁴ include: dialkylamino groups, such as adimethylamino group and a diethylamino group; alkoxy groups, such as amethoxy group, an ethoxy group, and a n-butoxy group; aryloxy groups,such as a phenoxy group, a 2,6-dimethylphenoxy group, and a naphthyloxygroup; alkyl groups each having 1 to 20 carbon atoms, such as a methylgroup, an ethyl group, a n-propyl group, an isopropyl group, a n-butylgroup, a n-octyl group, and a 2-ethylhexyl group; aryl groups, alkylarylgroups, or arylalkyl groups each having 6 to 20 carbon atoms, such as aphenyl group, a p-tolyl group, a benzyl group, a pentafluorophenylgroup, a 3,5-di(trifluoromethyl)phenyl group, a 4-tert-butylphenylgroup, a 2,6-dimethylphenyl group, a 3,5-dimethylphenyl group, a2,4-dimethylphenyl group, and a 1,2-dimethylphenyl group; halogens, suchas F, Cl, Br, and I; and organometalloid groups, such as atetramethylantimony group, a trimethylsilyl group, a trimethylgermylgroup, a diphenylarsine group, a dicyclohexylantimony group, and adiphenylboron group.

Specific examples of the substituted cyclopentadienyl group representedby each of R¹⁰ and R¹¹ include a methylcyclopentadienyl group, abutylcyclopentadienyl group, and a pentamethylcyclopentadienyl group.

In the present invention, specific examples of the anion with aplurality of groups bonded to boron include B(C₆F₅)₄ ⁻, B(C₆HF₄)₄ ⁻,B(C₆H₂F₃)₄ ⁻, B(C₆H₃F₂)₄ ⁻, B(C₆H₄F)₄ ⁻, B(C₆CF₃F₄)₄ ⁻, B(C₆H₅)₄ ⁻, andBF₄ ⁻.

In addition, examples of the metal cation include Cp₂Fe⁺, (MeCp)₂Fe⁺,(tBuCp)₂Fe⁺, (Me₂Cp)₂Fe⁺, (Me₃Cp)₂Fe⁺, (Me₄Cp)₂Fe⁺, (Me₅Cp)₂Fe⁺, Ag⁺,Na⁺, and Li⁺. In addition, examples of the other cation include: anitrogen-containing compound, such as pyridinium,2,4-dinitro-N,N-diethylanilinium, diphenylammonium, p-nitroanilinium,2,5-dichloroaniline, p-nitro-N,N-dimethylanilinium, quinolinium,N,N-dimethylanilinium, or N,N-diethylanilinium; a carbenium compound,such as triphenylcarbenium, tri(4-methylphenyl)carbenium, ortri(4-methoxyphenyl)carbenium; an alkyl phosphonium ion, such as CH₃PH₃⁺, C₂H₅PH₃ ⁺, C₃H₇PH₃ ⁺, (CH₃)₂PH₂ ⁺, (C₂H₅)₂PH₂ ⁺, (C₃H)₂PH₂ ⁺,(CH₃)₃PH⁺, (C₂H₅)₃PH⁺, (C₃H₇)₃PH⁺, (CF₃)₃PH⁺, (CH₃)₄P⁺, (C₂H₅)₄P⁺, or(C₃H₇)₄P⁺; and an aryl phosphonium ion, such as C₆H₅PH₃ ⁺, (C₆H₅)₂PH₂ ⁺,(C₆H₅)₃PH⁺, (C₆H₅)₄P⁺, (C₂H₅)₂(C₆H₅) PH⁺, (CH₃)(C₆H₅)PH₂ ⁺,(CH₃)₂(C₆H₅)PH⁺, or (C₂H₅)(C₆H₅)₂P⁺.

In the present invention, there is given a coordination complex compoundformed by arbitrarily combining the metal cation and an anion.

Among the compounds of the general formulae (III) and (IV),specifically, the following compounds may be particularly preferablyused.

Examples of the compound of the general formula (III) includetriethylammonium tetraphenylborate, tri(n-butyl) ammoniumtetraphenylborate, trimethylammonium tetraphenylborate, triethylammoniumtetrakis(pentafluorophenyl)borate, tri(n-butyl)ammoniumtetrakis(pentafluorophenyl)borate, triethylammonium hexafluoroarsenate,pyridinium tetrakis(pentafluorophenyl)borate, pyrroliniumtetrakis(pentafluorophenyl)borate, N,N-dimethylaniliniumtetrakis(pentafluorophenyl)borate, and methyldiphenylammoniumtetrakis(pentafluorophenyl)borate.

Meanwhile, examples of the compound of the general formula (IV) includeferrocenium tetraphenylborate, dimethylferroceniumtetrakis(pentafluorophenyl)borate, ferroceniumtetrakis(pentafluorophenyl)borate, decamethylferroceniumtetrakis(pentafluorophenyl)borate, acetylferroceniumtetrakis(pentafluorophenyl)borate, formylferroceniumtetrakis(pentafluorophenyl)borate, cyanoferroceniumtetrakis(pentafluorophenyl)borate, silver tetraphenylborate, silvertetrakis(pentafluorophenyl)borate, trityl tetraphenylborate, trityltetrakis(pentafluorophenyl)borate, and silver tetrafluoroborate.

A preferred coordination complex compound is one formed of anon-coordinating anion and a substituted triarylcarbenium. As thenon-coordinating anion, for example, there may be given a compoundrepresented by the general formula (V):(BZ¹Z²Z³Z⁴)⁻  (V)wherein in the general formula (V), Z¹ to Z⁴ each represent a hydrogenatom, a dialkylamino group, an alkoxy group, an aryloxy group, an alkylgroup having 1 to 20 carbon atoms, an aryl group (including ahalogen-substituted aryl group) having 6 to 20 carbon atoms, analkylaryl group, an arylalkyl group, a substituted alkyl group, anorganometalloid group, or a halogen atom.

Meanwhile, as the substituted triarylcarbenium, for example, there maybe given a compound represented by the general formula (VI).(CR¹³R¹⁴R¹⁵)⁺  (VI)

R¹³, R¹⁴, and R¹⁵ in the general formula (VI) each represent an arylgroup, such as a phenyl group, a substituted phenyl group, a naphthylgroup, or an anthracenyl group, and may be identical to or differentfrom each other, provided that at least one thereof represents asubstituted phenyl group, a naphthyl group, or an anthracenyl group.

The substituted phenyl group may be represented by, for example, thegeneral formula (VII).C₆H_(5-k)R¹⁶ _(k)  (VII)

R¹⁶ in the general formula (VII) represents a hydrocarbyl group having 1to 10 carbon atoms, an alkoxy group, an aryloxy group, a thioalkoxygroup, a thioaryloxy group, an amino group, an amide group, a carboxylgroup, or a halogen atom, and k represents an integer of from 1 to 5.

When k represents 2 or more, a plurality of R¹⁶'s may be identical to ordifferent from each other.

Specific examples of the non-coordinating anion represented by thegeneral formula (V) may include tetra(fluorophenyl)borate,tetrakis(difluorophenyl)borate, tetrakis(trifluorophenyl)borate,tetrakis(tetrafluorophenyl)borate, tetrakis(pentafluorophenyl)borate,tetrakis(trifluoromethylphenyl)borate, tetra(toluyl)borate,tetra(xylyl)borate, (triphenyl, pentafluorophenyl)borate,[tris(pentafluorophenyl), phenyl]borate, andtridecahydride-7,8-dicarbaundecaborate.

In addition, specific examples of the substituted triarylcarbeniumrepresented by the general formula (VI) include tri(toluyl)carbenium,tri(methoxyphenyl)carbenium, tri(chlorophenyl)carbenium,tri(fluorophenyl)carbenium, tri(xylyl)carbenium, [di(toluyl),phenyl]carbenium, [di(methoxyphenyl), phenyl]carbenium,[di(chlorophenyl), phenyl]carbenium, [toluyl, di(phenyl)]carbenium,[methoxyphenyl, di(phenyl)]carbenium, and [chlorophenyl,di(phenyl)]carbenium.

The usage ratio (molar ratio) of the component (A) to the component (B)is preferably from 1/100 to 1/1, more preferably from 1/10 to 1/1.

<(C) Organoaluminum Compound>

The organoaluminum compound serving as the component (C) to be used inthe present invention is preferably an organoaluminum compound having analkyl group having 1 or more carbon atoms, specifically a compoundrepresented by the general formula (VIII):R¹⁷ _(v)AlJ_(3-v)  (VIII)wherein in the general formula (VIII), R¹⁷ represents an alkyl grouphaving 1 to 20 (preferably 2 to 8) carbon atoms, J represents a hydrogenatom, an alkoxy group having 1 to 20 (preferably 2 to 8) carbon atoms,an aryl group having 6 to 20 carbon atoms, or a halogen atom, vrepresents an integer of from 1 to 3, and when v represents 2 or more,R¹⁷'s may be identical to or different from each other, provided that atleast one R¹⁷ represents an alkyl group having 1 to 20 carbon atoms.

Specific examples of the compound represented by the general formula(VIII) include triethylaluminum, triisopropylaluminum,triisobutylaluminum, diethylaluminum chloride, ethylaluminum dichloride,diisobutylaluminum hydride, diethylaluminum hydride, and ethylaluminumsesquichloride.

In addition, an organoaluminum compound represented by the followinggeneral formula (iii) is preferably used as the (C) organoaluminumcompound:

Wherein in the general formula (iii), Rb represents an alkyl grouphaving 1 to 20 (preferably 2 to 8) carbon atoms, and Rb's may beidentical to or different from each other.

Specific examples of the compound represented by the general formula(iii) include trimethylaluminum, triethylaluminum, triisopropylaluminum,and triisobutylaluminum.

One kind of those organoaluminum compounds may be used, or two or morekinds thereof may be used in combination.

<(D) Aluminoxane Represented by General Formula (i) or (ii)>

The aluminoxane represented by the general formula (i) or (ii) servingas the component (D) to be used in the present invention includes achain aluminoxane represented by the general formula (i) and a cyclicaluminoxane represented by the general formula (ii):

wherein in the general formula (i), Ra represents an alkyl group having1 to 20 (preferably 2 to 8) carbon atoms, Ra's may be identical to ordifferent from each other, and n represents an integer of from 1 to 50;and

wherein in the general formula (ii), Ra and n are the same as those inthe general formula (i).

It is considered that when Ra in the general formulae (i) and (ii)represents an alkyl group having more than 20 carbon atoms, an alumoxaneis precipitated in a polymerization system and does not function.

From the above-mentioned viewpoint, Ra represents preferably an alkylgroup having 1 to 20 carbon atoms, more preferably an alkyl group having2 to 8 carbon atoms.

In addition, n in the general formulae (i) and (ii) represents anaverage degree of polymerization. It is considered that when nrepresents more than 50, an alumoxane is precipitated in apolymerization system and does not function.

From the above-mentioned viewpoint, n preferably represents from 1 to50.

Specific examples include aluminoxanes, such as ethylaluminoxane andisobutylaluminoxane. As a production method for the aluminoxane, thereis given a method involving bringing an organoaluminum compound intocontact with a condensing agent, such as water. Means therefor is notparticularly limited, and a reaction may be performed in accordance witha known method. One kind of those aluminoxanes may be used, or two ormore kinds thereof may be used in combination.

As described later, in a polymerization system in which activity hasbeen reduced owing to the presence of the component (N), in the case ofusing, as a promoter, the boron compound serving as the component (B),and as a scavenger, the organoaluminum compound serving as the component(C), when the aluminoxane serving as the component (D) is used as ascavenger, consequently, catalytic activity is dramatically improved,and a product polymer of high quality (that is, a product polymer ofintended quality) can be obtained.

In addition, in the production method for an olefin-based polymer of thepresent invention, from the viewpoint of obtaining excellent catalyticactivity, the molar ratio [(D)/(A)] of the molar quantity of an aluminumatom in the component (D) to the molar quantity of a transition metal inthe component (A) is preferably more than 2, more preferably 10 or more,still more preferably 20 or more.

In addition, in the production method for an olefin-based polymer of thepresent invention, from the viewpoint of obtaining excellent catalyticactivity, the molar ratio [(C)/(D)] of the molar quantity of an aluminumatom in the component (C) to the molar quantity of the aluminum atom inthe component (D) is preferably 0.01 or more, more preferably 0.05 ormore, still more preferably 0.10 or more, even still more preferably0.15 or more, even still more preferably more than 0.50, even still morepreferably more than 1.0, particularly preferably more than 1.5. Inaddition, the molar ratio [(C)/(D)] is preferably from 0.10 to 200, morepreferably from 0.15 to 200, still more preferably from 1.0 to 200, evenstill more preferably from 1.5 to 200.

In addition, as the component (D), there is preferably used such acomponent (D) that, with respect to catalytic activity in the case ofpolymerizing an olefin in the presence of a catalyst obtained bybringing the component (A), the component (B), and the component (C)into contact with each other, the catalytic activity in the case ofusing the component (D) in place of the component (B) (that is, the caseof polymerizing an olefin in the presence of a catalyst obtained bybringing the component (A), the component (D), and the component (C)into contact with each other) is 1/10 or less.

<(N) Nonpolymerizable Unsaturated Hydrocarbon>

The (N) nonpolymerizable unsaturated hydrocarbon is an unsaturatedhydrocarbon compound whose polymerization reaction does not proceed inthe presence of the components (A) to (C), and the component (N) is onekind of compound or a mixture of two or more kinds.

For example, when the component (A) is a double crosslinked metallocenecomplex, examples of the component (N) include: a disubstituted olefinhaving the α-position of an unsaturated bond substituted with twohydrocarbon groups, a trisubstituted olefin having the α-position of anunsaturated bond substituted with three hydrocarbon groups, or atetrasubstituted olefin having the α-position of an unsaturated bondsubstituted with four hydrocarbon groups, represented by the followinggeneral formula (iv); an alkyne represented by the following generalformula (v); and styrene having an aromatic hydrocarbon at theα-position of an unsaturated bond:

wherein in the general formula (iv), R^(a) to R^(d) each independentlyrepresent hydrogen or a hydrocarbon group having 1 or more carbon atoms,provided that at least two or more selected from R^(a) to R^(d) eachrepresent the hydrocarbon group having 1 or more carbon atoms; andR^(e)

R^(f)  (v)

wherein on the general formula (v), R^(e) and R^(f) each independentlyrepresent hydrogen or a hydrocarbon group having 1 or more carbon atoms.

Another example of the component (N) is an oligomer component of the rawmaterial olefin. In this case, the number of carbon atoms of thecomponent (N) is an integral multiple of (2 times, 3 times, 4 times, . .. ) the number of carbon atoms of the olefin raw material. For example,in the case of a polymerization reaction using propylene as the olefinraw material, the component (N) includes: compounds each having twice asmany carbon atoms as those of propylene, such as 3-methyl-2-pentene,2-hexene, 3-hexene, 2-methyl-2-pentene, 2,3-dimethylbutene,3-methyl-2-pentene, 2,3-dimethyl-1-butene, 4-methyl-2-pentene, 1-hexyne,2-hexyne, and 3-hexyne; and compounds each having three times as manycarbon atoms as those of propylene, such as 2-nonene, 3-nonene,4-nonene, 2-methyl-2-octene, 3-methyl-2-octene, 4-methyl-2-octene,5-methyl-2-octene, 6-methyl-2-octene, 7-methyl-2-octene,2,3-dimethyl-2-octene, 2,4-dimethyl-2-octene, 2,5-dimethyl-2-octene,2,6-dimethyl-2-octene, 2-ethyl-3-methyl-2-hexene,2-ethyl-4-methyl-2-hexene, 2-ethyl-4-methyl-2-hexene,2-methyl-3-ethyl-2-hexene, 2-methyl-3-ethyl-4-hexene,2-methyl-3-ethyl-5-hexene, 2,4-nonadiene, 2,5-nonadiene, 2,6-nonadiene,2,7-nonadiene, 2-nonyne, 3-nonyne, and 4-nonyne. One kind or two or morekinds of those compounds may be contained.

<Presumed Mechanism of Catalytic Activity Reduction by Component (N) andActivity Reduction Suppression by Component (D)>

Although a detailed reason is not clear, it is considered that when thecomponent (N) is present in a polymerization system, the component (N)is inserted into an active site of a catalyst obtained by bringing thecomponents (A) to (C) into contact with each other to form a dormantspecies (inactive species), with the result that catalytic activity ismarkedly reduced. It is considered that the vicinity of the unsaturatedbond of the component (N) is sterically bulky, and hence the component(N) is coordinated to the active site to increase activation energy forthe insertion into a polymer chain, resulting in the suppression of areaction. Probably because of this, when the component (N) is subjectedto a reaction with an active species of the catalyst obtained bybringing the components (A) to (C) into contact with each other, thedormant species is formed.

In the present invention, although a detailed reason is not clear, it isconsidered that by virtue of the mixing of the component (D), theformation of the dormant species, that is, the reaction between thecomponent (A) and the component (N) is inhibited, or the component (N)or an impurity generated because of the component (N) is separated fromthe generated dormant species to reactivate the component (A), and thuscatalytic activity is improved. Further, as described above, thecomponent (D) itself has markedly low catalytic activity if used as apromoter in place of the component (B) as compared to a catalyst systemusing the component (B) as a promoter, and hence when the component (D)is used so as to satisfy the features of the invention of the presentapplication, it is considered that a side reaction derived from thecomponent (D) other than an intended main reaction does not proceed atall or hardly proceeds, and hence does not reduce the quality of aproduct polymer of intended quality.

<Factor of Generation of Component (N)>

A production process for the olefin-based polymer is not particularlylimited, and includes a production process for the olefin-based polymerinvolving a step of purifying the olefin raw material, a polymerizationstep, a catalyst deactivation step, and a step of recycling the olefinraw material and the polymerization solvent.

A mechanism by which the nonpolymerizable unsaturated hydrocarbonserving as the component (N) is present in the olefin raw material orthe polymerization solvent is, for example, as follows: the case ofbeing mingled as an impurity in the olefin raw material; the case ofbeing generated from the component (C) by dissociation equilibrium inthe catalyst preparation step or the polymerization step in theproduction process for the olefin-based polymer; the case of beinggenerated through the purification step; the case of being generatedthrough the polymerization step; the case of being generated through thecatalyst deactivation step; or the case of being generated by thermaldecomposition of the polymer in a step of devolatilizing apolymerization solution.

When the component (C) is used as a scavenger, the olefin componentdifferent from the raw material monomer (which serves as thenonpolymerizable unsaturated hydrocarbon serving as the component (N))is generated from the component (C) to be used as the scavenger bydissociation equilibrium. For example, in the case oftriisobutylaluminum, an olefin component such as isobutylene isgenerated.

In the course of purifying the olefin raw material, oligomerization ofthe monomer proceeds owing to a loaded catalyst to generate thecomponent (N).

In the polymerization reaction of the olefin raw material, when abnormalinsertion on the active site occurs, the component (N) is generated.

In the catalyst deactivation step, oligomerization of the olefin rawmaterial proceeds owing to an insufficiently deactivated catalyst togenerate the component (N).

In the polymerization solution devolatilization step or distillationstep, a heated polymer undergoes thermal decomposition to generate thecomponent (N).

In order to recover an unreacted olefin raw material or thepolymerization solvent from the polymerization solution for reuse in thepolymerization step, the recycling step includes a step of removing afraction heavier than the olefin raw material or the polymerizationsolvent, or a step of removing a lighter fraction. The component (N)generated by the above-mentioned mechanism is incorporated into theunreacted olefin raw material or the polymerization solvent, butparticularly when in the recycling step, a difference between theboiling point of the component (N) and the boiling point of the olefinraw material or the polymerization solvent is 50° C. or less, thecomponent (N) is difficult to separate from the unreacted olefin rawmaterial or the polymerization solvent. The component (N) is moredifficult to separate when the difference between the boiling points is20° C. or less, and is still more difficult to separate when thedifference is 10° C. or less. As a result, the unreacted olefin rawmaterial or the solvent containing the component (N) is used again inthe polymerization step. It is considered that in the polymerizationstep, the nonpolymerizable unsaturated hydrocarbon serving as thecomponent (N) is gradually concentrated, and the component (N) isinserted into the active site of the catalyst to form a dormant species,with the result that catalytic activity is reduced.

Particularly in a polymerization step using a metallocene catalyst, whenthe component (N) is mingled at a molar ratio of its molar quantity of500 or more with respect to the molar quantity of the transition metalin the component (A), a problem occurs in that the olefin component isinserted into an active site of the metallocene complex to form adormant species, with the result that catalytic activity is markedlyreduced.

Therefore, the production method for an olefin-based polymer and anolefin polymerization catalyst to be described later of the presentinvention can be more effectively used when the molar ratio [(N)/(A)] ofthe molar quantity of the component (N) to the molar quantity of thetransition metal in the component (A) is 500 or more, and in particular,from the viewpoint that a continuous polymerization system capable ofmaintaining excellent catalytic activity can be achieved, are useful ina continuous polymerization system including a step of recycling apolymerization solvent or the like.

<Olefin Raw Material>

In the production method for an olefin-based polymer involving using theolefin polymerization catalyst of the present invention, the olefin rawmaterial is homopolymerized or copolymerized in the presence of thecomponents (A) to (D). In addition, the olefin raw material and one ormore kinds selected from other raw materials may be copolymerized.

The olefin raw material differs depending on the polymerization catalystto be used, and is not particularly limited, but is preferably ethyleneor an α-olefin having 3 to 30 carbon atoms. Examples of the α-olefinhaving 3 to 30 carbon atoms include α-olefins, such as propylene,1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene,1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-eicosene,4-phenyl-1-butene, 6-phenyl-1-hexene, 3-methyl-1-butene,4-methyl-1-butene, 3-methyl-1-pentene, 4-methyl-1-hexene,5-methyl-1-hexene, 3,3-dimethyl-1-pentene, 3,4-dimethyl-1-pentene,4,4-dimethyl-1-pentene, and vinylcyclohexane.

In addition, examples of the other raw materials include: dienes, suchas 1,3-butadiene, 1,4-pentadiene, and 1,5-hexadiene; halogen-substitutedα-olefins, such as hexafluoropropene, tetrafluoroethylene,2-fluoropropene, fluoroethylene, 1,1-difluoroethylene, 3-fluoropropene,trifluoroethylene, and 3,4-dichloro-1-butene; cyclic olefins, such ascyclopentene, cyclohexene, norbornene, 5-methylnorbornene,5-ethylnorbornene, 5-propylnorbornene, 5,6-dimethylnorbornene, and5-benzylnorbornene; and styrene-based compounds, e.g., alkylstyrenes,such as styrene, p-methylstyrene, p-ethylstyrene, p-propylstyrene,p-isopropylstyrene, p-butylstyrene, p-tert-butylstyrene,p-phenylstyrene, o-methylstyrene, o-ethylstyrene, o-propylstyrene,o-isopropylstyrene, m-methylstyrene, m-ethylstyrene, m-isopropylstyrene,m-butylstyrene, mesitylstyrene, 2,4-dimethylstyrene,2,5-dimethylstyrene, and 3,5-dimethylstyrene, alkoxystyrenes, such asp-methoxystyrene, o-methoxystyrene, and m-methoxystyrene, halogenatedstyrenes, such as p-chlorostyrene, m-chlorostyrene, o-chlorostyrene,p-bromostyrene, m-bromostyrene, o-bromostyrene, p-fluorostyrene,m-fluorostyrene, o-fluorostyrene, and o-methyl-p-fluorostyrene, andfurther, trimethylsilylstyrene, a vinylbenzoic acid ester, anddivinylbenzene.

One kind of the olefin raw materials may be used, or two or more kindsthereof may be used in combination. In addition, the olefin raw materialmay be used in combination with one or more kinds selected from otherraw materials.

Among them, one or more kinds selected from α-olefins each having 3 to30 carbon atoms and ethylene are preferably used. That the one or morekinds selected from α-olefins each having 3 to 30 carbon atoms andethylene are preferably used means the following cases as well: two ormore kinds of α-olefins each having 3 to 30 carbon atoms are used; andtwo or more kinds selected from α-olefins each having 3 to 30 carbonatoms are used in combination with ethylene.

<Polymerization Solvent>

There is no particular limitation on the polymerization solvent.Examples thereof include: aromatic hydrocarbons, such as benzene,toluene, xylene, and ethyl benzene; alicyclic hydrocarbons, such ascyclopentane, cyclohexane, methylcyclohexane, decalin, and tetralin;aliphatic hydrocarbons, such as pentane, hexane, heptane, and octane;and halogenated hydrocarbons, such as chloroform and dichloromethane.Among them, toluene, xylene, and decalin are preferred.

One kind of those solvents may be used alone, or two or more kindsthereof may be used in combination. In addition, a monomer, such as theα-olefin, to be used for polymerization may be used as the solvent.

<Polymerization Method>

A polymerization method in the production method for an olefin-basedpolymer of the present invention is not particularly limited, and anypolymerization method, such as a slurry polymerization method, asolution polymerization method, a vapor phase polymerization method, abulk polymerization method, or a suspension polymerization method, maybe adopted.

A polymerization temperature is generally from −100° C. to 250° C.,preferably from −50° C. to 200° C., more preferably from 0° C. to 130°C.

A polymerization pressure is preferably from normal pressure to 20 MPa(gauge), more preferably from normal pressure to 10 MPa (gauge).

A polymerization time is preferably from 5 minutes to 15 hours.

Further, as a method of controlling the molecular weight of theolefin-based polymer, for example, there are given: selection of thekind and use amount of each component, and the polymerizationtemperature; and polymerization in the presence of hydrogen.

In the production method for an olefin-based polymer of the presentinvention, the concentration of the component (A) is preferably from0.001 μmol/L to 500 μmol/L. When the concentration falls within thisrange, satisfactory activity is obtained. From such viewpoint, theconcentration of the component (A) is more preferably from 0.005 μmol/Lto 250 μmol/L, still more preferably from 0.01 lpmol/L to 100 lpmol/L.The concentration of the component (A) herein refers to theconcentration of the component (A) in a polymerization liquid.Therefore, the concentration of the component (A) refers to thefollowing amount: in the case of a reaction system using a solvent and aliquid monomer, the amount of the component (A) with respect to thetotal amount of the solvent and the liquid monomer; when a liquidmonomer is subjected to a reaction without the use of a solvent, theamount of the component (A) with respect to the liquid monomer; or whena gaseous monomer is subjected to a reaction using a solvent, the amountof the component (A) with respect to the solvent.

In the production method for an olefin-based polymer of the presentinvention, the concentration of the component (C) is preferably from0.0005 mmol/L to 10 mmol/L. When the concentration falls within thisrange, satisfactory activity is obtained. From such viewpoint, theconcentration of the component (C) is more preferably from 0.007 mmol/Lto 5 mmol/L, still more preferably from 0.01 mmol/L to 3.0 mmol/L. Theconcentration of the component (C) herein refers to the concentration ofthe component (C) in a polymerization liquid. Therefore, theconcentration of the component (C) refers to the following amount: inthe case of a reaction system using a solvent and a liquid monomer, theamount of the component (C) with respect to the total amount of thesolvent and the liquid monomer; when a liquid monomer is subjected to areaction without the use of a solvent, the amount of the component (C)with respect to the liquid monomer; or when a gaseous monomer issubjected to a reaction using a solvent, the amount of the component (C)with respect to the solvent.

In the production method for an olefin-based polymer of the presentinvention, the concentration of the component (D) is preferably from0.001 mmol/L to 100 mmol/L. When the concentration falls within thisrange, satisfactory activity is obtained. From such viewpoint, theconcentration of the component (D) is more preferably from 0.005 mmol/Lto 50 mmol/L, still more preferably from 0.001 mmol/L to 10 mmol/L. Theconcentration of the component (D) herein refers to the concentration ofthe component (D) in a polymerization liquid. Therefore, theconcentration of the component (D) refers to the following amount: inthe case of a reaction system using a solvent and a liquid monomer, theamount of the component (D) with respect to the total amount of thesolvent and the liquid monomer; when a liquid monomer is subjected to areaction without the use of a solvent, the amount of the component (D)with respect to the liquid monomer; or when a gaseous monomer issubjected to a reaction using a solvent, the amount of the component (D)with respect to the solvent.

Further, in the production method for an olefin-based polymer of thepresent invention, it is preferred that preliminary polymerization usingthe olefin polymerization catalyst to be described later or preliminarypolymerization during the course of the preparation of the catalyst beperformed. The preliminary polymerization may be performed by bringingthe catalyst or the catalyst during its preparation into contact with asmall amount of an olefin, and a reaction temperature in this case ispreferably from −20° C. to 100° C., more preferably from −10° C. to 70°C., still more preferably from 0° C. to 50° C. In addition, as a solventto be used in the preliminary polymerization, a solvent selected fromthe above-mentioned polymerization solvents is preferably used, and analiphatic hydrocarbon or an aromatic hydrocarbon is more preferred. Thepreliminary polymerization may be performed without any solvent. Inaddition, the amount of a preliminary polymerization product per 1 mmolof a transition metal component in the catalyst is preferably from 1 gto 10,000 g, and it is more preferred that conditions be adjusted sothat the amount may be from 10 g to 1,000 g.

[Olefin Polymerization Catalyst]

An olefin polymerization catalyst according to one aspect of the presentinvention is an olefin polymerization catalyst obtained by bringing thefollowing components (A) to (D) into contact with each other:

(A) a transition metal compound;

(B) a boron compound capable of forming an ion pair with the component(A);

(C) an organoaluminum compound represented by the following generalformula (VIII);

(D) an aluminoxane represented by the following general formula (i) or(ii):R¹⁷ _(v)AlJ_(3-v)  (VIII)wherein in the general formula (VIII), R¹⁷ represents an alkyl grouphaving 1 to 20 carbon atoms, J represents a hydrogen atom, an alkoxygroup having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbonatoms, or a halogen atom, v represents an integer of from 1 to 3, andwhen v represents 2 or more, R¹⁷'s may be identical to or different fromeach other, provided that at least one R¹⁷ represents an alkyl grouphaving 1 to 20 carbon atoms; and

wherein in the general formulae (i) and (ii), Ra represents an alkylgroup having 1 to 20 carbon atoms, Ra's may be identical to or differentfrom each other, and n represents an integer of from 1 to 50.

The component (A) to the component (N) are the same as the components(A) to (N) described above in the production method for an olefin-basedpolymer, and preferred examples thereof are also the same.

<Preparation Method for Olefin Polymerization Catalyst>

A preparation method for the olefin polymerization catalyst is notparticularly limited, and a hitherto known method may be utilized.

For example, the olefin polymerization catalyst may be prepared byadding the component (C) to a solvent and then adding the component (A),the component (B), and the component (D) to bring the components intocontact with each other. Further, the olefin polymerization catalyst maybe prepared in a polymerization reaction vessel by loading thecomponents into the polymerization reaction vessel, or may be preparedby mixing the components in another container in advance to prepare acatalyst solution, and loading the resultant catalyst solution into thepolymerization reaction vessel to perform a polymerization reaction. Asthe solvent to be used in the preparation of the olefin polymerizationcatalyst, the polymerization solvent exemplified in the productionmethod for an olefin-based polymer described above is preferably used.

The timing of mixing the component (D) with the components (A) to (C) tobring the components into contact with each other may be as follows: thecomponent (D) may be mixed during the preparation of a preliminarilyactivated catalyst obtained through preliminary polymerization by mixingthe components (A) to (C) in another container in advance, may be mixedafter the preparation of the preliminarily activated catalyst, may bemixed before the polymerization reaction of the olefin-based polymer, ormay be mixed after the initiation of polymerization to be brought intocontact with the other components. After the component (A), thecomponent (B), and the component (C) have been brought into contact witheach other, the component (D) is preferably brought into contact withthe resultant. It is considered that when the component (B) and thecomponent (D) are not allowed in advance to react with each other, areduction in activity, and a failure to obtain a polymer satisfyingdesired quality due to influences on physical properties of the polymerto be obtained can be prevented.

The ratio between the component (D) and each component described aboveis a ratio in the final amounts of the components (A) to (D), and theratios may be calculated from values determined by a method described inExamples to be described later for the molar quantities of the componentand atoms in the components prior to mixing of the components.

[Olefin-Based Polymer]

Through the use of the production method for an olefin-based polymer orthe olefin polymerization catalyst of the present invention, inparticular, polypropylene, polyethylene, or a copolymer of two or morekinds selected from α-olefins each having 3 to 30 carbon atoms andethylene can be obtained with high polymerization activity and intendedquality.

Herein, the intended quality refers to quality to be influenced asfollows: as described above, the component (N) different from the olefinraw material suppresses a growth reaction to reduce a molecular weight,or eliminates the olefin-based polymer from a dormant structure, andthus a terminal structure is changed; the component (N) is incorporatedinto the olefin-based polymer as a product, and thus a polymer having aprimary structure different from that of the intended olefin-basedpolymer (e.g., stereoregularity, molecular weight, and molecular weightdistribution) is mingled. Examples of the quality include variousmechanical characteristics, such as a tensile strength, a tensilestrain, and a modulus of elasticity, and characteristics such as amelting point and a limiting viscosity.

EXAMPLES

Next, the present invention is described in more detail with referenceto examples, but the present invention is not limited thereto.

[Measurement Methods]

Measurement values in the following Examples and Comparative Exampleswere measured using the methods described below.

(Measurement of Concentration of Component (N) in PolymerizationSolvent)

The concentration of the component (N) was quantified by creating acalibration curve through gas chromatography (GC) measurement of apolymerization solvent. A sampled polymerization solvent was subjectedto measurement using gas chromatography (trade name: 6890N,manufacturer: Agilent Technologies). The measurement was performed underthe following conditions: column used: HP-1 (total length: 60 m, innerdiameter: 32 mm, film thickness: 5 μm); temperature increase conditions:50° C. (5 minutes)→temperature increase at 10° C./min→230° C. (17minutes); injection volume: 1 μL; split: 50; injection: 200° C.; FID:250° C.; linear velocity: 30 cm/second; flow rate: 2.2 mL/minute; andpressure: 129 kPa. In the following Examples and Comparative Examples,2-methyl-2-pentene observed as a peak at 13.4 minutes was used as thecomponent (N) and measured for its concentration in the polymerizationsolvent.

(Measurement of Limiting Viscosity [i] of Olefin-Based Polymer)

The limiting viscosity of an obtained olefin-based polymer was measuredfor a 0.02 g/dL to 0.16 g/dL solution at 135° C. using a viscometer(manufactured by Rigo Co., Ltd., trade name: “VMR-053U-PC-F01”), anUbbelohde-type viscosity tube (bulb volume in measurement: 2 ml to 3 ml,capillary diameter: 0.44 mm to 0.48 mm), and tetralin as a solvent.

Production Example 1 (Preparation of Polymerization Catalyst A)

Under a stream of nitrogen at 25° C., a 1 L autoclave was loaded withanhydrous m-xylene (394 mL), then 6 mL (in terms of aluminum: 2 mol/L)of a heptane solution of triisobutylaluminum was added thereto, and themixture was stirred. To the solution,(1,2′-dimethylsilylene)(2,1′-dimethylsilylene)bis(3-trimethylsilylmethyl-indenyl)zirconiumdichloride (1.08 g, 1.6 mmol) and dimethylaniliniumtetrakis(pentafluorophenyl)borate (1.92 g, 2.4 mmol) were added. Whilethe mixture was stirred, the autoclave was charged with a propylene gas(0.05 MPa, 5.73 L), the temperature was increased to 40° C., and areaction was performed for 1 hour to provide a solution of a catalyst.

Example 1

A stainless-steel reaction vessel having an internal volume of 250 Lwith a stirrer was continuously supplied with n-heptane having mingledtherein 1,000 ppm by mass of 2-methyl-2-pentene at 26 L/h,triisobutylaluminum at 7.7 mmol/h in terms of aluminum, and the catalystA at 5.6 μmol/h in terms of zirconium and polyisobutylaluminoxane (pBAO)(manufactured by Tosoh Finechem Corporation) at 2.79 mmol/h in terms ofaluminum. At this time, the number of moles of aluminum in pBAO withrespect to the catalyst A was 500 equivalents.

The polymerization temperature was set to 65° C., and a polymerizationreaction was performed while propylene and hydrogen were continuouslysupplied so that the hydrogen partial pressure and the total pressure inthe reaction vessel were kept at 0.1 MPa and 1.0 MPa, respectively.

The n-heptane serving as the solvent of the resultant polymerizationsolution was removed to provide target polypropylene (polymerizationactivity: 10.0 tPP/gZr, [n]=0.9). The results are shown in Table 1below.

Comparative Example 1

A stainless-steel reaction vessel having an internal volume of 250 Lwith a stirrer was continuously supplied with n-heptane having mingledtherein 1,000 ppm by mass of 2-methyl-2-pentene at 26 L/h,triisobutylaluminum at 7.7 mmol/h in terms of aluminum, and the catalystA at 7.7 μmol/h in terms of zirconium.

The polymerization temperature was set to 65° C., and a polymerizationreaction was performed while propylene and hydrogen were continuouslysupplied so that the hydrogen partial pressure and the total pressure inthe reaction vessel were kept at 0.1 MPa and 1.0 MPa, respectively.

The n-heptane serving as the solvent of the resultant polymerizationsolution was removed to provide target polypropylene (polymerizationactivity: 6.3 tPP/gZr, [η]=0.9). The results are shown in Table 1 below.

TABLE 1 Item Example 1 Comparative Example 1 Addition amount ofcomponent (A) 5.6 7.7 (μmol-Zr/hr)*1 Addition amount of component (D)2.79 0 (mmol-Al/hr)*2 Presence amount of component (N) 1,000 1,000 (ppmby mass) Molar ratio [(D)/(A)] 500 0 (mol-Al/mol-Zr)*3 Molar ratio[(C)/(D)] 2.8 0 (mol-Al/mol-Al)*4 Polymerization activity 10.0 6.3(tPP/gZr)*5 [η] 0.9 0.9 (dL/g) *1Molar quantity in terms of zirconium(Zr) *2Molar quantity in terms of aluminum (Al) *3Ratio of molarquantity of Al in component (D) to molar quantity of Zr in component (A)*4Ratio of molar quantity of Al in component (C) to molar quantity of Alin component (D) *5Amount of polypropylene obtained per 1 g of Zr incomponent (A)

Example 2

A stainless-steel reaction vessel having an internal volume of 1 L witha stirrer was loaded with 300 mL of n-heptane having mingled therein 672ppm by mass of 2-methyl-2-pentene, 0.3 mmol of triisobutylaluminum interms of aluminum, 0.1 mmol of pBAO in terms of aluminum, and 0.2 μmolof the catalyst A in terms of zirconium. At this time, the number ofmoles of aluminum in pBAO with respect to the catalyst A was 500equivalents.

The polymerization temperature was set to 80° C., the reaction vesselwas charged with hydrogen at 0.05 MPa, and a polymerization reaction wasperformed while propylene was supplied so that the total pressure waskept at 0.65 MPa. The n-heptane serving as the solvent was removed toprovide 98.4 g of target polypropylene (polymerization activity: 5.4tPP/gZr, [η]=0.4). The results are shown in Table 2-1 below.

Example 3

A stainless-steel reaction vessel having an internal volume of 1 L witha stirrer was loaded with 300 mL of n-heptane having mingled therein1,679 ppm by mass of 2-methyl-2-pentene, 0.3 mmol of triisobutylaluminumin terms of aluminum, 0.3 mmol of pBAO in terms of aluminum, and 0.2μmol of the catalyst A in terms of zirconium. At this time, the numberof moles of aluminum in pBAO with respect to the catalyst A was 1,500equivalents.

The polymerization temperature was set to 80° C., the reaction vesselwas charged with hydrogen at 0.05 MPa, and a polymerization reaction wasperformed while propylene was supplied so that the total pressure waskept at 0.65 MPa. The n-heptane serving as the solvent was removed toprovide 19.1 g of target polypropylene (polymerization activity: 1.0tPP/gZr, [η]=0.4). The results are shown in Table 2-2 below.

Comparative Example 2

A stainless-steel reaction vessel having an internal volume of 1 L witha stirrer was loaded with 300 mL of n-heptane having mingled therein 672ppm by mass of 2-methyl-2-pentene, 0.3 mmol of triisobutylaluminum interms of aluminum, and 0.2 μmol of the catalyst A in terms of zirconium.

The polymerization temperature was set to 80° C., the reaction vesselwas charged with hydrogen at 0.05 MPa, and a polymerization reaction wasperformed while propylene was supplied so that the total pressure waskept at 0.65 MPa. The n-heptane serving as the solvent was removed toprovide 53.0 g of target polypropylene (polymerization activity: 2.9tPP/gZr, [η]=0.4). The results are shown in Table 2-1 below.

Comparative Example 3

A stainless-steel reaction vessel having an internal volume of 1 L witha stirrer was loaded with 300 mL of n-heptane having mingled therein1,679 ppm by mass of 2-methyl-2-pentene, 0.3 mmol of triisobutylaluminumin terms of aluminum, and 0.2 μmol of the catalyst A in terms ofzirconium.

The polymerization temperature was set to 80° C., the reaction vesselwas charged with hydrogen at 0.05 MPa, and a polymerization reaction wasperformed while propylene was supplied so that the total pressure waskept at 0.65 MPa. The n-heptane serving as the solvent was removed toprovide 6.0 g of target polypropylene (polymerization activity: 0.3tPP/gZr, [η]=0.4). The results are shown in Table 2-2 below.

TABLE 2-1 Item Example 2 Comparative Example 2 Addition amount ofcomponent (A) 0.2 0.2 (μmol-Zr)*1 Addition amount of component (D) 0.1 0(mmol-Al)*2 Presence amount of component (N) 672 672 (ppm by mass) Molarratio [(D)/(A)] 500 0 (mol-Al/mol-Zr)*3 Molar ratio [(C)/(D)] 3 0(mol-Al/mol-Al)*4 Polymerization activity 5.4 2.9 (tPP/gZr)*5 [η] 0.40.4 (dL/g) *1Molar quantity in terms of zirconium (Zr) *2Molar quantityin terms of aluminum (Al) *3Ratio of molar quantity of Al in component(D) to molar quantity of Zr in component (A) *4Ratio of molar quantityof Al in component (C) to molar quantity of Al in component (D) *5Amountof polypropylene obtained per 1 g of Zr in component (A)

TABLE 2-2 Item Example 3 Comparative Example 3 Addition amount ofcomponent (A) 0.2 0.2 (μmol-Zr)*1 Addition amount of component (D) 0.3 0(mmol-Al)*2 Presence amount of component (N) 1,679 1,679 (ppm by mass)Molar ratio [(D)/(A)] 1,500 0 (mol-Al/mol-Zr)*3 Molar ratio [(C)/(D)] 10 (mol-Al/mol-Al)*4 Polymerization activity 1.0 0.3 (tPP/gZr)*5 [η] 0.40.4 (dL/g) *1Molar quantity in terms of zirconium (Zr) *2Molar quantityin terms of aluminum (Al) *3Ratio of molar quantity of Al in component(D) to molar quantity of Zr in component (A) *4Ratio of molar quantityof Al in component (C) to molar quantity of Al in component (D) *5Amountof polypropylene obtained per 1 g of Zr in component (A)

INDUSTRIAL APPLICABILITY

Through the use of the production method for an olefin-based polymer andthe olefin polymerization catalyst of the present invention, catalyticactivity at the time of polymerization is high, and an olefin-basedpolymer of intended quality can be produced. In particular, theproduction method for an olefin-based polymer and the olefinpolymerization catalyst can be used more usefully in a continuouspolymerization system including a step of recycling a polymerizationsolvent or the like.

The invention claimed is:
 1. A method of producing an olefin-based polymer, the method comprising polymerizing an olefin raw material by contacting components (A) to (D) in the presence of component (N) in the olefin raw material or a polymerization solvent: (A) a transition metal compound; (B) a boron compound capable of forming an ion pair with the component (A); (C) an organoaluminum compound represented by a formula (VIII): R¹⁷ _(v)AlJ_(3-v)  (VIII) (D) an aluminoxane represented by a formula (i) or (ii):

(N) a nonpolymerizable unsaturated hydrocarbon; wherein: i R¹⁷ represents an alkyl group having 1 to 20 carbon atoms; J represents a hydrogen atom, an alkoxy group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, or a halogen atom; v represents an integer of from 1 to 3, and when v represents 2 or more, R¹⁷'s may be identical to or different from each other, provided that at least one R¹⁷ represents an alkyl group having 1 to 20 carbon atoms; Ra represents an alkyl group having 1 to 20 carbon atoms, Ra's may be identical to or different from each other; n represents an integer of from 1 to 50; the transition metal compound (A) is a double crosslinked metallocene complex represented by a formula (I):

M represents a metal element of Groups 3 to 10 of the periodic table or the lanthanoid series; E¹ and E² each represent a ligand selected from a substituted cyclopentadienyl group, an indenyl group, a substituted indenyl group, a heterocyclopentadienyl group, a substituted heterocyclopentadienyl group, an amide group, a phosphide group, a hydrocarbon group, and a silicon-containing group, form a crosslinked structure via A¹ and A², and may be identical to or different from each other; X represents a σ-bonding ligand, and when a plurality of X's are present, the plurality of X's may be identical to or different from each other, and X may be crosslinked with any other X, E¹, E², or Y; Y represents a Lewis base, and when a plurality of Y's are present, the plurality of Y's may be identical to or different from each other, and Y may be crosslinked with any other Y, E¹, E², or X; A¹ and A² each represent a divalent crosslinking group for bonding two ligands, and each represent a hydrocarbon group having 1 to 20 carbon atoms, a halogen-containing hydrocarbon group having 1 to 20 carbon atoms, a silicon-containing group, a germanium-containing group, a tin-containing group, —O—, —CO—, —S—, —SO₂—, —Se—, —NR¹—, —PR¹—, —P(O)R¹—, —BR¹—, or —AlR¹—, wherein R¹ represents a hydrogen atom, a halogen atom, a hydrocarbon group having 1 to 20 carbon atoms, or a halogen-containing hydrocarbon group having 1 to 20 carbon atoms, and may be identical to or different from each other; q represents an integer of from 1 to 5 representing [(valence of M)−2]; and r represents an integer of from 0 to
 3. 2. The method according to claim 1, wherein a molar ratio [(D)/(A)] of a molar quantity of an aluminum atom in the component (D) to a molar quantity of a transition metal in the component (A) is more than
 2. 3. The method according to claim 1, wherein a molar ratio [(C)/(D)] of a molar quantity of an aluminum atom in the component (C) to a molar quantity of an aluminum atom in the component (D) is 0.01 or more.
 4. The method according to claim 1, wherein the component (C) is represented by a formula (iii):

wherein in the formula (iii), Rb represents an alkyl group having 1 to 20 carbon atoms, and Rb's may be identical to or different from each other.
 5. The method according to claim 1, wherein the olefin raw material comprises an α-olefin having 3 to 30 carbon atoms, ethylene, or both.
 6. The method according to claim 1, wherein the nonpolymerizable unsaturated hydrocarbon (N) comprises a disubstituted olefin, a trisubstituted olefin, or a tetrasubstituted olefin represented by a formula (iv), or an alkyne compound represented by a formula (v):

wherein: R^(a) to R^(d) each independently represent hydrogen or a hydrocarbon group having 1 or more carbon atoms, provided that at least two selected from R^(a) to R^(d) each represent the hydrocarbon group; and R^(e) and R^(f) each independently represent hydrogen or a hydrocarbon group having 1 or more carbon atoms.
 7. The method according to claim 1, wherein a molar ratio [(N)/(A)] of a molar quantity of the component (N) to a molar quantity of a transition metal in the component (A) is 500 or more.
 8. An olefin polymerization catalyst, which is obtained by contacting components (A) to (D) with each other: (A) a transition metal compound; (B) a boron compound capable of forming an ion pair with the component (A); (C) an organoaluminum compound represented by a formula (VIII): R¹⁷ _(v)AlJ_(3-v)  (VIII) (D) an aluminoxane represented by a formula (i) or (ii):

wherein: R¹⁷ represents an alkyl group having 1 to 20 carbon atoms; J represents a hydrogen atom, an alkoxy group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, or a halogen atom; v represents an integer of from 1 to 3, and when v represents 2 or more, R¹⁷'s may be identical to or different from each other, provided that at least one R¹⁷ represents an alkyl group having 1 to 20 carbon atoms; Ra represents an alkyl group having 1 to 20 carbon atoms, Ra's may be identical to or different from each other, and n represents an integer of from 1 to 50; the transition metal compound (A) is a double crosslinked metallocene complex represented by a formula (I):

M represents a metal element of Groups 3 to 10 of the periodic table or the lanthanoid series; E¹ and E² each represent a ligand selected from a substituted cyclopentadienyl group, an indenyl group, a substituted indenyl group, a heterocyclopentadienyl group, a substituted heterocyclopentadienyl group, an amide group, a phosphide group, a hydrocarbon group, and a silicon-containing group, form a crosslinked structure via A¹ and A², and may be identical to or different from each other; X represents a α-bonding ligand, and when a plurality of X's are present, the plurality of X's may be identical to or different from each other, and X may be crosslinked with any other X, E¹, E² or Y; Y represents a Lewis base, and when a plurality of Y's are present, the plurality of Y's may be identical to or different from each other, and Y may be crosslinked with any other Y, E¹, E², or X; A¹ and A² each represent a divalent crosslinking group for bonding two ligands, and each represent a hydrocarbon group having 1 to 20 carbon atoms, a halogen-containing hydrocarbon group having 1 to 20 carbon atoms, a silicon-containing group, a germanium-containing group, a tin-containing group, —O—, —CO—, —S—, —SO₂—, —Se—, —NR¹—, —PR¹—, —P(O)R¹—, —BR¹—, or —AlR¹—, wherein R¹ represents a hydrogen atom, a halogen atom, a hydrocarbon group having 1 to 20 carbon atoms, or a halogen-containing hydrocarbon group having 1 to 20 carbon atoms, and may be identical to or different from each other; q represents an integer of from 1 to 5 representing [(valence of M)−2]; and r represents an integer of from 0 to
 3. 9. The olefin polymerization catalyst according to claim 8, wherein a molar ratio [(D)/(A)] of a molar quantity of an aluminum atom in the component (D) to a molar quantity of a transition metal in the component (A) is more than
 2. 10. The olefin polymerization catalyst according to claim 8, wherein a molar ratio [(C)/(D)] of a molar quantity of an aluminum atom in the component (C) to a molar quantity of an aluminum atom in the component (D) is 0.01 or more.
 11. The method according to claim 1, wherein the transition metal compound (A) is a double crosslinked metallocene complex represented by a formula (II):

wherein: M represents a metal element of Groups 3 to 10 of the periodic table or the lanthanoid series; X¹ represents a a-bonding ligand, and when a plurality of X¹'s are present, the plurality of X¹'s may be identical to or different from each other, and X¹ may be crosslinked with any other X¹ or Y¹; Y¹ represents a Lewis base, and when a plurality of Y¹'s are present, the plurality of Y¹'s may be identical to or different from each other, and Y¹ may be crosslinked with any other Y¹ or X¹; A¹ and A² each represent a divalent crosslinking group for bonding two ligands, and each represent specifically a hydrocarbon group having 1 to 20 carbon atoms, a halogen-containing hydrocarbon group having 1 to 20 carbon atoms, a silicon-containing group, a germanium-containing group, a tin-containing group, —O—, —CO—, —S—, —SO₂—, —Se—, —NR¹—, —PR¹—, —P(O)R¹—, —BR¹—, or —AlR¹—, wherein R¹ represents a hydrogen atom, a halogen atom, a hydrocarbon group having 1 to 20 carbon atoms, or a halogen-containing hydrocarbon group having 1 to 20 carbon atoms, and may be identical to or different from each other; R⁴ to R⁹ each represent a hydrogen atom, a halogen atom, a hydrocarbon group having 1 to 20 carbon atoms, a halogen-containing hydrocarbon group having 1 to 20 carbon atoms, a silicon-containing group, or a hetero atom-containing group, and it is necessary that at least one of R⁴ to R⁹ not represent a hydrogen atom; q represents an integer of from 1 to 5 representing [(valence of M)−2]; and r represents an integer of from 0 to
 3. 12. The olefin polymerization catalyst according to claim 8, wherein the transition metal compound (A) is a double crosslinked metallocene complex represented by a formula (II):

wherein: represents a metal element of Groups 3 to 10 of the periodic table or the lanthanoid series; X¹ represents a n-bonding ligand, and when a plurality of X¹'s are present, the plurality of X¹'s may be identical to or different from each other, and X¹ may be crosslinked with any other X¹ or Y¹; Y¹ represents a Lewis base, and when a plurality of Y¹'s are present, the plurality of Y¹'s may be identical to or different from each other, and Y¹ may be crosslinked with any other Y¹ or X¹; A¹ and A² each represent a divalent crosslinking group for bonding two ligands, and each represent a hydrocarbon group having 1 to 20 carbon atoms, a halogen-containing hydrocarbon group having 1 to 20 carbon atoms, a silicon-containing group, a germanium-containing group, a tin-containing group, —O—, —CO—, —S—, —SO₂—, —Se—, —NR¹—, —PR¹—, —P(O)R¹—, —BR¹—, or AlR¹—, wherein R¹ represents a hydrogen atom, a halogen atom, a hydrocarbon group having 1 to 20 carbon atoms, or a halogen-containing hydrocarbon group having 1 to 20 carbon atoms, and may be identical to or different from each other; R⁴ to R⁹ each represent a hydrogen atom, a halogen atom, a hydrocarbon group having 1 to 20 carbon atoms, a halogen-containing hydrocarbon group having 1 to 20 carbon atoms, a silicon-containing group, or a hetero atom-containing group, and it is necessary that at least one of R⁴ to R⁹ not represent a hydrogen atom; q represents an integer of from 1 to 5 representing [(valence of M)−2]; and r represents an integer of from 0 to
 3. 13. The method according to claim 1, wherein the component (A), the component (B), and the component (C) are contacted with each other to obtain a resultant, and then the component (D) is contacted with the resultant. 